Quarterly report pursuant to Section 13 or 15(d)

Investment in Joint Ventures - Company's Share of Unconsolidated Joint Ventures' Income (Loss) (Detail)

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Investment in Joint Ventures - Company's Share of Unconsolidated Joint Ventures' Income (Loss) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Schedule of Equity Method Investments [Line Items]        
Income (loss) from equity method investments $ 1,428 $ 970 $ 2,649 $ 2,086
Sovran HHF Storage Holdings LLC [Member]        
Schedule of Equity Method Investments [Line Items]        
Income (loss) from equity method investments 747 861 1,401 1,783
Sovran HHF Storage Holdings II LLC [Member]        
Schedule of Equity Method Investments [Line Items]        
Income (loss) from equity method investments 389 446 721 901
Other Unconsolidated Joint Ventures [Member]        
Schedule of Equity Method Investments [Line Items]        
Income (loss) from equity method investments $ 292 $ (337) $ 527 $ (598)